Power conditioner for feeding system

1. A power conditioner for a feeding system comprising: a first AC-DC and DC-AC converter for performing conversion between AC power and DC power; and a nickel-metal hydride battery disposed between and connected to a high-voltage cable at DC side of the first AC-DC and DC-AC converter and a low-voltage cable at the DC side of the first AC-DC and DC-AC converter; and a first transformer which receives AC power from AC power line and feeds the AC power to a feeder; wherein AC side of the first AC-DC and DC-AC converter is connected to power receiving side or power feeding side of the first transformer; and wherein the first transformer is a transformer which converts a received three-phase AC voltage into two two-phase AC voltages having a phase difference of 90 degrees and feeds the two two-phase AC voltages.

2. The power conditioner according to claim 1 , wherein the nickel-metal hydride battery has a layer-stacked structure.

3. The power conditioner according to claim 1 , wherein the nickel-metal hydride battery includes a conductive material containing carbon.

4. A power conditioner for a feeding system comprising: a first AC-DC and DC-AC converter for performing conversion between AC power and DC power; a nickel-metal hydride battery disposed between and connected to a high-voltage cable at DC side of the first AC-DC and DC-AC converter and a low-voltage cable at the DC side of the first AC-DC and DC-AC converter; a first transformer which receives AC power from AC power line and feeds the AC power to a feeder; wherein AC side of the first AC-DC and DC-AC converter is connected to power receiving side or power feeding side in the first transformer; a second AC-DC and DC-AC converter for performing conversion between AC power and DC power; wherein the first transformer is a transformer which converts received three-phase AC voltage into two-phase AC voltages and feeds the two-phase AC voltages; the first AC-DC and DC-AC converter is connected to a feeder which receives one of the two-phase voltages fed from the first transformer; the second AC-DC and DC-AC converter is connected to a feeder which receives the other of the two-phase voltages fed from the first transformer; and the nickel-metal hydride battery is disposed between and connected to a common high-voltage cable between DC side of the first AC-DC and DC-AC converter and DC side of the second AC-DC and DC-AC converter and a low-voltage cable between the DC side of the first AC-DC and DC-AC converter and the DC side of the second AC-DC and DC-AC converter.

5. The power conditioner according to claim 4 , further comprising: a first switch provided between the first transformer and the first AC-DC and DC-AC converter; and a second switch provided between the first transformer and the second AC-DC and DC-AC converter.

6. The power conditioner according to claim 4 , wherein the nickel-metal hydride battery has a layer-stacked structure.

7. The power conditioner according to claim 4 , wherein the nickel-metal hydride battery includes a conductive material containing carbon.

8. A power conditioner for a feeding system comprising: a first AC-DC and DC-AC converter for performing conversion between AC power and DC power; a nickel-metal hydride battery disposed between and connected to a high-voltage cable at DC side of the first AC-DC and DC-AC converter and a low-voltage cable at the DC side of the first AC-DC and DC-AC converter; a first transformer which receives AC power from AC power line and feeds the AC power to a feeder; wherein AC side of the first AC-DC and DC-AC converter is connected to power receiving side or power feeding side in the first transformer; a second transformer which receives AC power from AC power line and feeds the AC power to a feeder; and a second AC-DC and DC-AC converter for performing conversion between AC power and DC power; wherein each of the first transformer and the second transformer is a transformer which receives single-phase AC voltage; the first AC-DC and DC-AC converter is connected to a feeder which receives AC voltage fed from the first transformer; the second AC-DC and DC-AC converter is connected to a feeder which receives AC voltage fed from the second transformer; and the nickel-metal hydride battery is disposed between and connected to a high-voltage cable between the DC side of the first AC-DC and DC-AC converter and DC side of the second AC-DC and DC-AC converter and a low-voltage cable between the DC side of the first AC-DC and DC-AC converter and the DC side of the second AC-DC and DC-AC converter.

9. The power conditioner according to claim 8 , further comprising: a first switch provided between the first transformer and the first AC-DC and DC-AC converter; and a second switch provided between the second transformer and the second AC-DC and DC-AC converter.

10. The power conditioner according to claim 8 , wherein the nickel-metal hydride battery has a layer-stacked structure.

11. The power conditioner according to claim 8 , wherein the nickel-metal hydride battery includes a conductive material containing carbon.

12. A power conditioner for a feeding system comprising: a first AC-DC and DC-AC converter for performing conversion between AC power and DC power; and a nickel-metal hydride battery disposed between and connected to a high-voltage cable at DC side of the first AC-DC and DC-AC converter and a low-voltage cable at the DC side of the first AC-DC and DC-AC converter; wherein the nickel-metal hydride battery is composed of one or more battery modules; each of the battery modules includes plural unit batteries, each of which includes a plate-shaped positive electrode current collector and a plate-shaped negative electrode current collector which are provided opposite to each other; a separator disposed between the positive electrode current collector and the negative electrode current collector; and a positive electrode cell being in contact with the positive electrode current collector, and a negative electrode cell being in contact with the negative electrode current collector, the plural unit batteries being stacked together such that the positive electrode current collector of one of adjacent unit batteries and the negative electrode current collector of the other of the adjacent unit batteries are opposite to each other, and the battery module has between the adjacent unit batteries, a passage through which a gaseous or liquid heat transmitting medium flows.

13. The power conditioner according to claim 12 , wherein the nickel-metal hydride battery has a layer-stacked structure.

14. The power conditioner according to claim 12 , wherein the nickel-metal hydride battery includes a conductive material containing carbon.

15. A power conditioner, for a feeding system comprising: a first AC-DC and DC-AC converter for performing conversion between AC power and DC power; a nickel-metal hydride battery disposed between and connected to a high-voltage cable at DC side of the first AC-DC and DC-AC converter and a low-voltage cable at the DC side of the first AC-DC and DC-AC converter; and a second AC-DC and DC-AC converter for performing conversion between AC power and DC power; wherein AC side of the first AC-DC and DC-AC converter is connected to an end portion of a first feeding section; AC side of the second AC-DC and DC-AC converter is connected to an end portion of a second feeding section which is electrically isolated from the first feeding section; and the nickel-metal hydride battery is disposed between and connected to a common high-voltage cable between the DC side of the first AC-DC and DC-AC converter and DC side of the second AC-DC and DC-AC converter and a low-voltage cable between the DC side of the first AC-DC and DC-AC converter and the DC side of the second AC-DC and DC-AC converter.

16. The power conditioner according to claim 15 , wherein the nickel-metal hydride battery has a layer-stacked structure.

17. The power conditioner according to claim 15 , wherein the nickel-metal hydride battery includes a conductive material containing carbon.